EASA SIB 2008-59R1: Turboshaft-engine Powered Rotorcraft - Engine In-Flight Shutdown due to Ice and Snow Ingestion

What to do

Operators should review rotorcraft flight manuals for icing and snow operation limitations, use reliable weather and icing forecasts, and install inlet and exhaust covers when parked outside. Before engine start, thorough inspections for ice and snow accumulation must be conducted, using approved deicing methods rather than scraping. Pilots should follow published procedures for inadvertent icing encounters and consider landing promptly after flight in snow or icing conditions to inspect the engine inlet. No mandatory compliance deadline is specified.

Summary

EASA Safety Information Bulletin 2008-59R1 is an advisory document addressing the risk of engine in-flight shutdown in turboshaft-engine powered rotorcraft caused by ice and snow ingestion. It applies to all turboshaft-engine powered rotorcraft and aligns with FAA Special Airworthiness Information Bulletin SW-08-03R4. The bulletin highlights the dangers of ice and snow accumulation in engine inlets during ground and flight operations, particularly in helicopters not approved for flight into known icing conditions.

What changed

EASA SIB 2008-59R1 revises and reissues previous guidance to emphasize ongoing concerns about ice and snow ingestion leading to engine power loss and accidents, including fatal ones. It supports FAA recommendations and stresses the importance of using meteorological data and icing forecasts rather than general website information. The bulletin updates operational recommendations and inspection procedures to mitigate the risk of engine shutdown due to ice and snow.

Why it matters

This bulletin is critical for aviation professionals as it raises awareness of a significant safety hazard that can cause engine failure in turboshaft rotorcraft, especially during winter operations. Operators and maintenance teams must understand the risks of ice and snow ingestion to prevent accidents and ensure safe flight operations. Compliance with recommended inspection and operational procedures can reduce the likelihood of engine power loss and improve overall rotorcraft safety.